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Novel methodology for hydrotalcite (Mg6Al2(OH)16CO3.4H2O) synthesis from aqueous suspensions of magnesium oxide (MgO) and aluminum hydroxide (Al(OH)3) and its application in porous ceramics for high temperature thermal insulation

Abstract

The combination of aluminum oxide (Al2O3) with hydrotalcite (Mg6Al2(OH)16CO3×4H2O) based poregenerators or double layered hydroxides (DLH) results in structures with high porosity (greater than 50 %) and with low sintering driving force, even at high temperatures (1500-1650ºC). Due to these effects, this system presents suitable properties for applications involving thermal insulation and high temperature filtration. Theconventional hydrotalcite (analytical grade) is usually obtained through co-precipitation methods from soluble Mg and Al salts, in alkaline medium. These methods require high purity reactants, present low output and residual cations (Na+ and K+) which require a further step of purification, such as centrifugation or filtration. Concerning its use in large scale as thermal insulating, it is necessary to develop a more effective and withless cost alternative method of synthesis for hydrotalcite. Previous works of the proponent of the present project (supported by FAPESP) have shown that hydrotalcite nanoparticles can be formed from the combination of magnesium oxide (MgO) and hydratable alumina (rho-Al2O3) or aluminum hydroxide (Al(OH)3) in aqueoussuspensions, in large quantities and without needing of purification steps. Due to this, this project aims to: 1)Optimize this novel synthesis technique for hydrotalcite , determining the best conditions for its formation (characteristics of the particles, mixing, kinetics, temperature and pH of the suspensions); 2) Evaluate thehydrotalcite synthesized as pore generator in porous ceramics (pores fraction, mechanical strength, refractoriness under load and thermal conductivity), comparing with the conventional material; 3) Establish the necessary background for the development of a novel product, attained from national raw materials and with high technological applicability. (AU)

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Scientific publications (15)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SALOMAO, RAFAEL; ARRUDA, CEZAR C.; SOUZA, ADRIANE D. V.; FERNANDES, LEANDRO. Novel insights into MgO hydroxylation: Effects of testing temperature, samples' volume and solid load. CERAMICS INTERNATIONAL, v. 40, n. 9, p. 7-pg., . (10/19274-5)
FERNANDES, LEANDRO; DE CARVALHO, RENATA AQUINO; AMARAL, ANDRE CAPALDO; PECORARO, EDISON; SALOMAO, RAFAEL; TROUATTI, ELIANE. Mullite cytotoxicity and cell adhesion studies. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T, v. 8, n. 3, p. 2565-2572, . (10/19274-5)
FERNANDES, LEANDRO; SALOMAO, RAFAEL. Preparation and Characterization of Mullite-Alumina Structures Formed ``In Situ{''} from Calcined Alumina and Different Grades of Synthetic Amorphous Silica. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 21, n. 3, . (10/19274-5)
SALOMAO, RAFAEL; ARRUDA, CEZAR C.; SOUZA, ADRIANE D. V.; FERNANDES, LEANDRO. Novel insights into MgO hydroxylation: Effects of testing temperature, samples' volume and solid load. CERAMICS INTERNATIONAL, v. 40, n. 9, B, p. 14809-14815, . (10/19274-5)
SALOMAO, RAFAEL; SOUZA, ADRIANE D. M.; FERNANDES, LEANDRO; ARRUDA, CEZAR C.. Advances in nanotechnology for refractories: When very small meets hot, heavy, and large. American Ceramic Society Bulletin, v. 92, n. 7, p. 22-27, . (10/19274-5)
SOUZA, ADRIANE D. V.; ARRUDA, CEZAR C.; FERNANDES, LEANDRO; ANTUNES, MARIA L. P.; KIYOHARA, PEDRO K.; SALOMAO, RAFAEL. Characterization of aluminum hydroxide (Al(OH)(3)) for use as a porogenic agent in castable ceramics. Journal of the European Ceramic Society, v. 35, n. 2, p. 803-812, . (10/19274-5)
LEANDRO FERNANDES; RAFAEL SALOMÃO. Preparation and Characterization of Mullite-Alumina Structures Formed "In Situ" from Calcined Alumina and Different Grades of Synthetic Amorphous Silica. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 21, n. 3, . (10/19274-5)
RAFAEL SALOMÃO; LEANDRO FERNANDES. Hydroxylation Studies on High-Solid Load Magnesia Aqueous Suspensions. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 26, . (10/19274-5, 18/19773-3)
DE SOUSA, LUCIOLA LUCENA; SALOMAO, RAFAEL; ARANTES, VERA LUCIA. Development and characterization of porous moldable refractory structures of the alumina-mullite-quartz system. CERAMICS INTERNATIONAL, v. 43, n. 1, B, p. 1362-1370, . (10/19274-5)
SOUZA, ADRIANE D. V.; SALOMAO, RAFAEL. Evaluation of the porogenic behavior of aluminum hydroxide particles of different size distributions in castable high-alumina structures. Journal of the European Ceramic Society, v. 36, n. 3, p. 885-897, . (10/19274-5)
SOUZA, A. D. V.; SOUSA, L. L.; FERNANDES, L.; CARDOSO, P. H. L.; SALOMAO, RAFAEL. Al2O3-Al(OH)(3)-Based castable porous structures. Journal of the European Ceramic Society, v. 35, n. 6, p. 1943-1954, . (10/19274-5)
COSTA, LIGIA M. M.; SAKIHAMA, JOSE; SALOMAO, R.. Characterization of porous calcium hexaluminate ceramics produced from calcined alumina and microspheres of Vaterite (mu-CaCO3). Journal of the European Ceramic Society, v. 38, n. 15, p. 5208-5218, . (10/19274-5)
SALOMAO, RAFAEL; FERNANDES, LEANDRO. Porous co-continuous mullite structures obtained from sintered aluminum hydroxide and synthetic amorphous silica. Journal of the European Ceramic Society, v. 37, n. 8, p. 2849-2856, . (10/19274-5)
DE SOUSA, LUCIOLA LUCENA; SALOMAO, RAFAEL; ARANTES, VERA LUCIA. Development and characterization of porous moldable refractory structures of the alumina-mullite-quartz system. CERAMICS INTERNATIONAL, v. 43, n. 1, p. 9-pg., . (10/19274-5)

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